Abbvie Inc. COM 00287Y109 2302 14243 SH SOLE 0 0 14243 Adobe COM 00724F101 10405 30919 SH SOLE 0 0 30919 Advanced Micro Devices Inc COM 007903107 367 5665 SH SOLE 0 0 5665 Air Products COM 009158106 17781 57681 SH SOLE 0 0 57681 Alcon COM h01301128 16426 239628 SH SOLE 0 0 239628 Alphabet Inc Cap Sk Cl A COM 02079K305 1337 15150 SH SOLE 0 0 15150 Alphabet Inc Cap Sk Cl C COM 02079k107 367 4140 SH SOLE 0 0 4140 Amazon COM 023135106 9782 116449 SH SOLE 0 0 116449 Amphenol COM 032095101 14380 188858 SH SOLE 0 0 188858 Apple COM 037833100 47787 367793 SH SOLE 0 0 367793 Automatic Data Processing COM 053015103 45250 189442 SH SOLE 0 0 189442 Bank Of America Corporation Ne COM 060505104 210 6342 SH SOLE 0 0 6342 Becton Dickinson COM 075887109 21140 83131 SH SOLE 0 0 83131 Berkshire Hathaway Cl B COM 084670702 572 1852 SH SOLE 0 0 1852 Black Stone Minerals L Com Uni COM 09225m101 2404 142512 SH SOLE 0 0 142512 Blackstone Inc Com COM 09260D107 375 5055 SH SOLE 0 0 5055 Bristol Myers Squibb COM 110122108 476 6615 SH SOLE 0 0 6615 Chevron Corp COM 166764100 1598 8905 SH SOLE 0 0 8905 Chipotle Mexican Grill Com COM 169656105 277 200 SH SOLE 0 0 200 Cintas COM 172908105 20505 45404 SH SOLE 0 0 45404 Coca-Cola COM 191216100 27192 427479 SH SOLE 0 0 427479 Colgate Palmolive COM 194162103 227 2877 SH SOLE 0 0 2877 Conocophillips COM 20825C104 555 4703 SH SOLE 0 0 4703 Costco Whsl Corp New COM 22160K105 210 461 SH SOLE 0 0 461 Cullen Frost Bank COM 229899109 242 1807 SH SOLE 0 0 1807 Cvs Health COM 126650100 333 3571 SH SOLE 0 0 3571 Danaher Corp COM 235851102 502 1891 SH SOLE 0 0 1891 Donaldson COM 257651109 30506 518193 SH SOLE 0 0 518193 Dorchester Minerals Lp COM 25820R105 1569 52423 SH SOLE 0 0 52423 Dover COM 260003108 28807 212738 SH SOLE 0 0 212738 Ecolab COM 278865100 23839 163775 SH SOLE 0 0 163775 Emerson Electric COM 291011104 26797 278962 SH SOLE 0 0 278962 Exxon Mobil Corp COM 30231g102 5446 49371 SH SOLE 0 0 49371 FedEx COM 31428x106 20338 117422 SH SOLE 0 0 117422 First Financial Bankshares COM 32020R109 252 7336 SH SOLE 0 0 7336 Home Depot COM 437076102 690 2183 SH SOLE 0 0 2183 Honeywell International COM 438516106 27438 128034 SH SOLE 0 0 128034 Illinois Tool Works COM 452308109 38830 176258 SH SOLE 0 0 176258 Intel COM 458140100 14147 535266 SH SOLE 0 0 535266 International Business Machine COM 459200101 474 3365 SH SOLE 0 0 3365 Intuit COM 461202103 14839 38125 SH SOLE 0 0 38125 Intuitive Surgical COM 46120e602 17943 67622 SH SOLE 0 0 67622 Ishares Tr S&p Midcap 400 COM 464287507 312 1288 SH SOLE 0 0 1288 Johnson & Johnson COM 478160104 32098 181702 SH SOLE 0 0 181702 Jp Morgan Chase & Co COM 46625H100 1098 8188 SH SOLE 0 0 8188 Lam Resh Corp COM 512807108 719 1711 SH SOLE 0 0 1711 Linde Plc Com COM G5494j103 297 912 SH SOLE 0 0 912 Lowes Cos Inc COM 548661107 839 4211 SH SOLE 0 0 4211 Mastercard Inc Cl A COM 57636q104 1747 5025 SH SOLE 0 0 5025 McCormick COM 579780206 19028 229558 SH SOLE 0 0 229558 Mcdonald's Corp. COM 580135101 310 1175 SH SOLE 0 0 1175 Medtronic Plc COM g5960l103 642 8260 SH SOLE 0 0 8260 Merck & Co Inc COM 58933Y105 584 5265 SH SOLE 0 0 5265 Microsoft COM 594918104 74025 308668 SH SOLE 0 0 308668 Mondelez Intl Inc Cl A COM 609207105 441 6610 SH SOLE 0 0 6610 National Instruments COM 636518102 16346 442980 SH SOLE 0 0 442980 Netflix Inc COM 64110L106 300 1017 SH SOLE 0 0 1017 Nike COM 654106103 328 2804 SH SOLE 0 0 2804 Nokia COM 654902204 61 13126 SH SOLE 0 0 13126 Nordson COM 655663102 52081 219084 SH SOLE 0 0 219084 Novartis Ag COM 66987V109 1061 11698 SH SOLE 0 0 11698 Nvidia COM 67066G104 454 3105 SH SOLE 0 0 3105 Paccar COM 693718108 25645 259118 SH SOLE 0 0 259118 Paypal COM 70450Y103 308 4330 SH SOLE 0 0 4330 Pepsico COM 713448108 31198 172688 SH SOLE 0 0 172688 Pfizer COM 717081103 219 4265 SH SOLE 0 0 4265 Procter & Gamble COM 742718109 31597 208478 SH SOLE 0 0 208478 S&p Global Inc COM 78409v104 352 1051 SH SOLE 0 0 1051 Sabine Royalty Trust Ubi COM 785688102 1196 14000 SH SOLE 0 0 14000 Salesforce Inc. COM 79466L302 222 1676 SH SOLE 0 0 1676 San Juan Basin Royalty Trust COM 798241105 9277 812306 SH SOLE 0 0 812306 Select Sector Spdr Tr Sbi Int- COM 81369y886 238 3373 SH SOLE 0 0 3373 Spdr Gold Trust Gold Shs COM 78463v107 450 2650 SH SOLE 0 0 2650 Stryker COM 863667101 15650 64009 SH SOLE 0 0 64009 Sysco Corp COM 871829107 383 5013 SH SOLE 0 0 5013 Taiwan Semiconductor COM 874039100 21905 294069 SH SOLE 0 0 294069 Telefonica de Espana COM 879382208 50 13916 SH SOLE 0 0 13916 Thermo Fisher COM 883556102 13881 25206 SH SOLE 0 0 25206 Tractor Supply Co COM 892356106 426 1891 SH SOLE 0 0 1891 Union Pacific Corp. COM 907818108 315 1520 SH SOLE 0 0 1520 United Parcel Service COM 911312106 4613 26537 SH SOLE 0 0 26537 Unitedhealth Group COM 91324P102 1093 2061 SH SOLE 0 0 2061 Vanguard FTSE Developed Market COM 921943858 309 7372 SH SOLE 0 0 7372 Vanguard Index Fds Reit Viper COM 922908553 489 5931 SH SOLE 0 0 5931 Vanguard Index Fds S&p 500 Etf COM 922908363 882 2509 SH SOLE 0 0 2509 Visa Inc-Class A Shrs COM 92826C839 455 2190 SH SOLE 0 0 2190 W.W. Grainger COM 384802104 211 380 SH SOLE 0 0 380 Walt Disney COM 254687106 376 4327 SH SOLE 0 0 4327 Waste Management Inc Del COM 94106L109 549 3500 SH SOLE 0 0 3500