U. S. & CAN.] THE NATURALISTS' DIRECTORY. 227 
5510 Thruston, Gates P., Vice Pres. Term. Hist. Soc., Nashville, 
Teim. Arch., Gem Minerals, Numis. C.* 
5511 Thum, H., Sanitarian, Grand Rapids, Mich. Mic., Sanita- 
rium Pharm., Chem. 
5512 Thurlow, Frank T., 226 East Frederick St., Lancaster, Pa. 
Photog., On., Ool. C. Ex.* 
5513 Thurston, Chas. O., Prof. Sci., Wyoming Seminary, Kings- 
ton, Pa. Bot: Phcen. Plants, Ferns, Mosses.* 
5514 Thurston, John H., Cambridge, Mass. Mic., Photog. C. 
Ex.* 
5515 Thurston, Robert H , M.A., LL.D., Dr. Engineering, Dir. 
Sibley Coll., Prof. M. E., Cornell Univ., Ithaca, N. Y. 
Mechanical Engineering.* 
5516 Thwing, Chas. B., A.M., Instr. in Physics, Northwestern 
Univ., Evanstou, Cook Co., 111. Physics, Elect., Ast., 
Photog* 
5517 Tibbals, Wm. H., A.M., Ph.D., Prof. Philos., Liter, and Sci., 
Salt Lake City, Utah. Irrigation * 
5518 Tibbals, Wm. I., Ph.C., 102 Prospect Ave., Buffalo, N. Y. 
Chem., Metall* 
5519 Tidswell, Thos. J., Independence, Jackson Co., Mo. Invert. 
Palceo., Ast., Arch. C.* 
5520 Tiffany, Dr. AsaS., F.G.S.A., 1221 Rock Island St., Daven- 
port, la. Veg. Palceo., Strat. Geol., Min.,Crystall., Lithol., 
Geog. Dist., Arch., Fossil Sponges. C.* 
5521 Tight, Wm. G., M.S., Granville, Ohio. Bot., Strat. Geol., 
Lithol., Mic., Photog., Zool, Gen. Biol.,Anth., Tax., Histol., 
Ent. C. Ex.* 
5522 Tilden, John N., Peekskill, Westchester Co., N. Y. Min., 
Lithol. C. Ex. Meteorites de-sired; ex. or purchase.* 
5523 Tillman, Samuel E., Prof. Chem., Min. and Geol., U. S. Mili- 
tary Acad., West Point, N. Y. 
5524 Tillman, Walter, 426 So. 5th St., Lacrosse, Wis. Min., Ool. 
C* 
5525 Tilton, John L., Prof. Nat. Sci., Simpson College, Indianola, 
la. Geol* 
5526 Tindall, Chas. W., Independence, Mo. Orn., Ool* 
5527 Tingley, J. Prof. Biol., High School, Allegheny, Pa.? 
5528 Tinsley, John D., Miller School, Crozet, Va. Phcen. Plants, 
Ferns, Min., Inorg. Chem., Mic., Gen. Biol, Herpetol. C. 
Ex.* 
5529 Titus, Wm. M., Box 1092, St. Thomas, Ont., Can. Bibliog. 
C.* 
5530 Todd, Aurelius, Eugene, Lane Co., Ore. On., Ool, Geol, 
Ent., Mam., Min., Tax. A good stock on hand for sale. 
Special rates to dealers. Will collect to order in other 
branches. Dealers' correspondence solicited. 
5531 Todd, David H., Kansas City, Mo. Fossils, Minerals, and 
Crystallized spec. Has a large number of specimens to ex. 
Will buy, sell or exchange. 
6532 Todd, Prof. David P., Dir. Amherst Coll. Observ., Amherst, 
Mass. Nautical Almanac Office, Washington, D. C. Ast. 
