and Laboratory Methods. 1145 



Quartz. Sur un groupe de cristaux de quartz The group consists of three crystals 

 de Striegan (silesie). F. Gonnard. Bull. . , ^. , n i i i- 



Soc Min 22: 02 i8qq. with vertical axes parallel, and pecuhar 



arrangement of faces. Eight forms are 



noticed, of which three [(13.0. 13.1), (5051), (2577)] are probably new, one being 



a new plagiohedron. l. McI. l. 



Quartz. Etude cristallographiquedu quartz Quartz occurs in clear, pellucid bi- 

 des geodes des marnes oxfordiennes de '■ 



Meylan (Isere). F. Gonnard. Bull. Soc. pyramids, modified by very small prism 

 Min. 22: 94, 1899. faces, and also showing a large num- 



ber of new or rare forms. Tabulation of these forms given. Liquid inclusions 

 with air bubbles also noticed, and the Assuring of the crystals, sometimes ob- 

 served, is thought to be due to the expansion of this liquid. l. McI. l. 



Stokesite. A.Hutchinson. Phil. Mag., Nov., Description from a single crystal (10 

 ^ ' mm. long) in Cambridge Mineralogical 



Museum. Orthorhombic, with forms ^ (010) and z' (121). a:/?:c=0.M7Q:l:- 

 0.8117. Cleavage perfect, parallel to l>, and also good parallel to prism, taken 

 as unite; fracture, conchoidal ; H.=6 — 6.5; G.^3.185 ; lustre, vitreous, pearly 

 on ^ ,• colorless. Partial chemical examination determines it as a hydrated 

 silicate of Na and Ca, with about 6 per cent, of tin oxide, replacing part of the 

 SiOa- 



L. McI. L. 



Medical Notes. 



Note on Examination of Blood. — A microscopical examination of the 

 stained specimen of pathological blood implies a comparison with the appearance 

 of normal blood when subjected to the same straining process. The experienced 

 observer unconsciously makes use of his mental picture of the normal specimen 

 in doing this work, and to him it is sufficient. In fixing and staining blood 

 spreads, however, a slight variation in technique may produce a decided differ- 

 ence in results, consequently those who have had comparatively little experience 

 in such work will find it difficult to secure uniform results without a considerable 

 laboratory equipment. In preparing pathological specimens in such cases a 

 spread of normal blood may, at the same time, be subjected to the same technique 

 and mounted on the slide with the pathological specimen, making exact and 

 reliable comparison a very easy matter. Dried blood spreads can be kept 

 indefinitely, so a supply of normal specimens can easily be kept constantly in 

 readiness for use. W. A. Fulton, M. D. 



Burlington, Wis. 



Kober. The Presence of Diphtheria Bacilli in Examinations were made in 128 cases 

 the Mouths of Healthy Individuals. Zeit. , . , , ^ , , 



f. Hyg. 31 : 4^3. which were known to have been ex- 



posed to diphtheria, and in 600 cases 

 which were supposedly not so exposed. The investigations included microscopical 

 study, cultivation upon serum, and inoculation of guinea pigs. Of the 128 cases, 



