1896 THE MICROSCOPE. 91 



the same oyster-bed was undertaken later by Mr. D. 

 M'Crorie, lecturer on bacteriolog-y at St. Mung-o's Colleg"e, 

 and he was able to isolate from them six distinct g^erms, 

 of which four, including- Bacillus fluorescens liquefaciens and a 

 vibrio, liquefied g-elatin. The fifth was a typhoid-like bac- 

 illus and the sixth a torula. The typhoid-like bacillus was 

 found to differ considerably from the Bacillus typhosus of 

 Eberth, Drs. Kanthack and V. D. Harris agreeing- with 

 Mr. M'Crorie on this point, and it was therefore assumed 

 to be one of the pseudo-typhoids. It was found to differ 

 from Eberth's bacillus in being- virtually non-pathog-enic 

 to animals, and having- a different optimum temperature, 

 b'esides which it did not seem to posses so many flag-ella. 

 The vibrio isolated was larg-er than Koch's cholera vibrio, 

 but closely resembled the Finkler-Prior bacillus, and 

 there was no reason to suspect that it played any part in 

 the causation of the fever. — Pharmaceutical Journal. 



Counting Blood-Corpuscles. — Dr. Judson Daland, of 

 Philadelphia, has invented an instrument for counting- 

 blood-corpuscles, according to the Physician and Surgeon. 

 It works on the centrifug-al-force principle, and accom- 

 plishes the measurement by means of comparative bulks. 

 A quantity of blood is placed in a finely graduated tube 

 and the latter revolved at a speed of about 1,000 revolu- 

 tions a minute. The corpuscles divide by force of gravity, 

 and form on the sides of the tube in easily traceable divi- 

 sions of red corpuscles, white corpuscles and serum. The 

 new method permits of larg-er, and, consequently, more 

 representalive quantitatives being- used in experimenting-, 

 besides doing- away with actual microscopic counting-. — 

 Medical Times. 



A Process of Sealing Glass Vacuum Tubes. — In making- 

 vacuum tubes it has been the almost universal custom to 

 attach a branch for exhaustion. But Mr. T. Bolas, who is 

 well known to be an expert in this kind of manipulation, 

 finds it much more convenient to avoid the extra branch 

 and exhaust where a platinum wire is sealed in. For this 

 purpose the end last closed is drawn out until the bore is 



