PEOGEESS OF MICEOSCOPICAL SCIENCE. 69 



very full account of all the modern work that has been done upon the 

 histology of tendon and other varieties of the more distinct connective 

 tissues ; that is, upon those forms of the tissue which essentially 

 consist of the white or inelastic structure. Besides giving the views of 

 many other workers on this subject, he enters upon the distinctions 

 between the views held by Herr Boll, who published a paper in the 

 ' Archiv fur Mikroscopische Anatomie' (one of the numbers for 1871), 

 and M. Banville, who published his opinion in the ' Archives de 

 Physiologie ' (Part II., 1869), After discussing these views he 

 then sums up his own, and gives an admirable plate in illus- 

 tration of his opinions. 



When the two following reached us last year, we gave them to a 

 friend to notice. He, however, has been since out of the country, and 

 hence they have been forgotten. We now can only give the titles, 

 and express our regret that they were not noticed earlier : — 



' Su la illuminazione monochromatica del microscopio e la fotomi- 

 crografia e loro utilita Nota del Sig. Conte Abate Francesco Castracane.' 

 Bonia, 1871. And also 'Esame microscopico e note critiche su un 

 campione di fango atlantico ottennto nella spedizione del " Porcupine " 

 nell' anno 1869 ; Memoria dell' Ab. F. C. Castracane.' The first 

 memoir is accompanied by an admirable photographic plate, the best 

 we think we have ever seen, even Colonel Woodward's being, if any- 

 thing, inferior. It represents three species of Diatoms, Arachnodiscus 

 ornatus, Cocconeis punctatissima, and a species of Eupodiscus. They 

 are reproduced by the well-known Albert-type, and exhibit the 

 elevations on Cocconeis admirably. The second memoir relates 

 particularly to the various diatoms collected by the expedition. 



[We regret that owing to the late date at which we received Dr. 

 Bastian's book from Messrs. Macmillan, we are compelled to postpone 

 our notice to the next number.] 



PROGRESS OF MICEOSCOPICAL SCIENCE. 



Structure of the Wliite Blood Corpuscle. — Dr. Eichardson, of Ame- 

 rica, has recently published a very able paper on this subject, from 

 which the following may betaken as a summary: — The white blood 

 corpuscle is a cell composed of, in the first place, a nucleus (or nuclei) 

 which possesses the power of independent amoeboid movement, and is 

 insoluble in water, but capable of slowly imbibing that fluid until 

 swollen to nearly double its normal size. The cell wall of the cor- 

 puscle is a membranous envelope, insoluble in water even when boil- 

 ing, too thin to exhibit a double contour with a magnifying power of 

 1200 diameters, but firm enough to restrict the movement of its con- 

 tained granules within its limits. Its exterior is adhesive, so that 



