Hayden, Ferdinand Vandeveer, 182^-87, American geologist. 



National Academy of Sciences. Biographical memoirs. 1877-1909. 

 V.3. p.397-413 r 925 N15 V.3 



Philosophical Society of Washington. Bulletin. 1888-91. v.ii, 

 p. 476-478 r 506 W27 V.II 



Hayes, Augustus Allen, 1806-82, American chemist. 



American Academy of Arts and Sciences. Proceedings. 1883. v.i8, 

 p.422-427 qr 506 A5122P V.18 



Hayes, Richard Somers, 1845-1905, American engineer. 



American Society of Civil Engineers. Transactions. 1905. v.55, 



p.448-450 r 620.5 A51 v.55 



Hays, Isaac, 1796-1879, American physician. 



American Academy of Arts and Sciences. Proceedings. 1880. v.15, 



P-38o-38i qr 506 A5122P v.15 



Hayward, Robert Baldwin, 1829-1903, English mathematician. 



Royal Society of London. Proceedings. 1904-05. v.75, 



p.270-272 r 506 RSipr v.75 



Hazen, Henry Allen, 1849-1900, American meteorologist. 



Philosophical Society of Washington. Bulletin. 1900. v.13, p.401- 



404 ' r 506 W27 V.13 



Hazen, William B. 1830-87, American meteorologist. 



Nature. 1887. v.35, P-54I-543 qr 505 N15 v.35 



*Hedley, William, 1 779-1843, English mechanical engineer. 



Layson. Great engineers, p. 269-284 926 L44 



Heer, Oswald, 1809-83, Swiss paleohotanist. 



American Academy of Arts and Sciences. Proceedings. 1884. v.19, 

 P-556-559 qr 506 A5122P v.19 



Popular science monthly. 1886. v.29, p. 546-553 r 505 P81 v.29 



Hegeman, Allen B. 1861-92, American engineer. 



American Society of Civil Engineers. Proceedings. 1893. v.19, 



P171 r 620.6 A51P V.19 



Heilprin, Angelo, 1853-1907, Hungarian-American geologist. 



Geological Society of America. Bulletin. 1909. v.19, 



P.S27-536 qr 550.5 B87 V.19 



Heinrich, Oswald J. 1827-86, German mining engineer. 



American Institute of Mining Engineers. Transactions. 1886. v.14, 



p. 784-789 r 622.05 A51 



Helmholtz, Hermann Ludwig Ferdinand von, 1821-94, German physiol- 

 ogist and physicist. 



American Academy of Arts and Sciences. Proceedings, v. 30, p.592- 

 598 qr 506 A5122P V.30 



Chemical Society of London. Memorial lectures, 1893-1900. 1901. 

 p.885-912 925.4 C42 



Konigsberger. Hermann von Helmholtz. 1906 92 H429k 



M'Kendrick. Hermann Ludwig Ferdinand von Helmholtz. 

 1899 92 H429m 



76 



