^MKMOIUS OF TIIK NATIONAL .VCAKKMY Ol" SCIKNCKS. 



HI 



riHiliii',', tlif \vasliin}js deposited o«i;iln'(li;il <r\s(als. This process was rcpeati'd sevcnil times 

 witli otluM- portions of prepiu-atioii 21. In most cases the liltratc <leposited apparently rhomho- 

 hedral and the washing's oct^iliedral crystals. The residues, which had been (iltered out, were 

 a,s far as possible dissolved and crystallized, from 1 per cent brine yieldioff either octaliedral 

 cry.stals (.r niixtnres ofoctahcdra and rhoinhohedra. The dilVerent <-rops of crystals were collected 

 on separate lilters, accovdin^- as they were wholly rhondx.iiedra or octahedra, or mixtures of the 

 two. Three [(reparations, 24, 25, and 26, were obtained in this way, which were, as usual, washed 

 with water, alcohol, and ether, and dried at IK*'^ for analysis. Thus prepared they retained their 

 crystalline form entirely unehanired, and ba<l in all respects the same properties as the mother 

 substance 21. The accompanyint: plate, from a photograph, for which I am indebted t<i Prof. M. < ;. 

 ^Vllit^^ illustrates tliesc crystals and a single S])heroiil, magnifieil about «(K) diameters. I'rof. S. 

 L. I'eufield examined these crystals and states that they aiipear to ber!iomi)oiiedra and octahedra, 

 although the former have no action on polarized light, lie suggests that the apparent rhombohe- 

 dra may be octahedra with but six foces developed, such crystals occurring in nature, but as their 

 diameters are but a few hundreths of a millimeter, this point can not be detinitely determined by 

 measurement. Analyses of the three preparations gave the following percentages: 



Crystallized OatProteiil, dericvd/rom 21. 



(Prep.iratioii 24.) 



Carbon .. 

 Hydrogen 

 Nitrogen 

 Sulphur.. 

 Oxygen . 

 Ash 



As/i.— 0.4f!00 gram substance dried at llO^ 0. gave 0.0003 gram of ash=O.OG per cent. 

 Carbon and hydrogeu.-^AidS gram dried substance gave 0.8835 gram C02=52.14 per cent G. 

 and 0.2795 gram IliO^G.OIj per cent H. 



Ai7(w/(«.— 0.4042 gram dried substance gave G;i.Occ. N. at n°C. (barometer 756.3°"". at 21° C.) = 

 17.02 per cent N. 



,S'h//;/(m>-.— 0.6345 gram dried substance gave 0.0242 gram BaSO4=0.0033 gram 8=0.53 per 

 cent. 



CryxtaUi:rd Oatl'rolciil, derived from 21. 

 (Prep.-iratiou 26.) 



^ls/,._0.20.35 gram substance dried at 110° O. gave 0.0004 gram ash=0.20 jier cent. 



Carbon and /((/r/ror/e/i.— 0.2562 gram dried substance gave 0.4885 gram 00^=52 00 per cent G. 

 and 0.1635 gram 11,0 = 7.00 per cent H. 



Xitrofjen.—t).3'.y.i.-) gram dri.<i substance gave 61.3cc N. at 17° G. (barometer 756. 5"'"'. at 21'3 

 G.)=17.91 per cent N. 



S. Mis. 169 6 



