,'i.'J() MKMOUIAI, Ol" .M).Si;ril IIDNUY. 



ili<; Viiryiiif^ l<;ii}!,(li, under <li(l<!n:iil- (ciiipcniliirc^H, of" tlic nicaHift'iiif^ 

 npjKiraliiH of the l»iw(! liiicH of" llu; DiuIxmI SI-uUih (.'oiihI- iSiirv(!y." * 

 'riii.s wonderfully niidroHcopic; niciiHuring iij)|>iiralnH —devised l»y 

 Mr. .loM('|)li iSiixton, wan ea|)al)le of <liKlingiii.sliinj; ( hy means of IIkj 

 liglit-ray indctx of il.s eonlael, refl(!el(»r,) a dinK-nsion e(|ijal to a half 

 wavc-l(!nf;(h of" avera^;e li}i,hl, or (he l()(),()0()lh pari, of an inch. 

 Tho long under-ground vaulljs of (Ik; iSniil.h.s(»nian hnilding having 

 l)(!<;n Htleel-ed an u Huilahh; |)lace f"or l,he jireeiHe verilic^al.ion of (Jio 

 r(wi<lual <;o-(!fli<;ic'nL of eornpeuHated Uiniperaturc expunHion of the 

 l)a,s(! rods of th(; Hurv<;y, Uie opjK)r(unil.y was seized hy Henry, at 

 (he Ixtiininalion of fh<! invctstigafion, to apply the saine d(!rK!Uto 

 ajtpaialiis l,o (,h<! delxrrniinal.ion of the polari/cid or niagiK^l/u! (!xpari- 

 Hion. TIk! rcHidlH of" these d(;lieate and interesting investigations 

 are l<»st, to the woild. 



In less than six years from the tJuK; of these researehes, Ik; waH 

 (called on to mourn the death of his life-long intimate and honored 

 friend, who ha<l always <:xhihit,('d ho hrotlu^rly a Hymj)athy and 

 eo-operation with his own varied lahors. in eons<Mpi(;nee of" this 

 evftnt — (Ju! d(!uth of Ids fritsnd Professor A. Dallas liaehe in IH()7, 

 Henry waH ehos(!n in IHtJS, to ho his sueetwsor iM l*resi<lent of the 

 Nat/ioniil A(;ad(;my of iSei(!ne(!S. At the rcupiest of that, hody, ho 

 prepariid a (-ulogy of" his f"riend the late President,, whi<!h was read 

 before the Academy April Kith, IHOi). In grateful acknowledg- 

 ment, of the wise (mjuukcIs and valnahh; s(Mvi<H'S of" I )r. Hache as on(; 

 of the Smithsonian Ivc^cnts, he observed: "In IHKI he had hei-n 

 named in the act of in<;orporatiou nH one of" the l^egent.s of the 

 Smithsonian rnstitiition, and l>y HU(X!eHHivo rc-el(!(;(,i()ii Wius eontinned 

 hy (/ongr(!HH in this ofVau! until his d(!ath, a period of n(!arly twenty 

 years. 'To say that Ik; assisted in shaping the j)oli(!y of" th(! estiih- 

 lishment would not he (enough, it was almost exclusively through 

 his pr(;dominating influen(H: th;it the policy which lias givc^n the 

 Institut.ion il.H pre.s(!id, <;(;lehrit,y, was aftcir mu(;h opposition finally 

 ado|)t(!d. - - - |*rof(;ssor Hache with piirsistxjut firnmess tem- 

 pered hy his usual moderation, advoeuUid the appro|)riation of the 

 proccedu uf the funds |>rin(;i|)ally to tJa; plan sc^t forth in the first 



Nmltlmouliin llipi'it for IHdl.p. MH. 



