180 PROGRESS OF MICROSCOPICAL SCIENCE. 



they are flowing out, exhibit some very agile corpuscles, the diameter 

 of which is barely equal to *002 mm., and which, considering their 

 resemblance to what are termed ' spermatozoids ' in the Vaucherice, 

 ought to be regarded as the fecundating corpuscles. After the evacua- 

 tion of the antheridia, the gonospheres are found to be covered with 

 cellulose ; they then constitute so many oospores, with solid walls, if 

 I may use an expression specially applied to the algaa by M. Pring- 

 sheim. Phenomena which are analogous in several respects and have 

 been studied in the Vaucherice and other conferva?, as also direct 

 observations which are due to M. Pringsheim, do not permit of any 

 doubt but that the cellulosic membrane, which appears on the surface 

 of the gonospheres, is only the consequence of sexual fecundation, 

 and that this ought not to be attributed to the corpuscles which 

 issue from the antheridea, which would penetrate into the gonospheres, 

 and unite with their substance." It then goes on to deal fully with 

 the subject for two or more pages, but we have not space to proceed 

 farther. 



Pathological Appearance of the Jaw after "Resection of the Maxillary 

 Bone. — Dr. Goodwillie, of New York, recently read a paper partly on 

 the above subject before the Medical Society of his county. He says 

 that on making a section of the tumour through the longitudinal direc- 

 tion of the teeth, there was to be seen the following : at the apex of 

 the second molar tooth there was a small, soft cyst, containing some 

 pus, and for a short distance surrounding this the bone appeared quite 

 cancellated, but the rest of the tumour was quite dense in structure. 

 The pulps of the canine and first bicuspid had still some vitality, but 

 that of the second bicuspid was dead. The pulp-chambers were 

 decreased in size by a deposit of osteo-dentine to their walls, slight 

 hypertrophy of the cementum on the fangs. A large nerve entered 

 the tumour on its buccal side. The microscopical examination of this 

 tumour, as made by Dr. J. W. S. Arnold, shows that it is " composed 

 of cancellated tissue almost entirely. The outer edge of a thin layer 

 of more compact bony tissue. In the spongy part a small amount of 

 soft marrow, containing the usual constituents of foetal marrow, i. e. 

 medulla-cells, and myelo-plaxes with oil-globules." 



The Union of Divided Tendons. — A paper with the title of " The 

 Minute Processes in the Union by the first intention of Divided 

 Tendons," by Herr Paul Gicterbock, of, Berlin, is well abstracted 

 in a late number of the 'Lancet.' It appears that the observer's 

 work was most of it done at the well-known Brown-Institution of 

 London. The experiments were made on the Achilles tendons of 

 nearly full-grown white rats. The tendons were never entirely, but 

 only partially divided, the object being to avoid much separation of 

 the cut surfaces, and any considerable effusion of blood, which neces- 

 sarily occur when a stretched tendon is completely divided. The 

 operation was done with a sharp-pointed tenotome, the tendons being 

 removed under chloroform, together with the lower portion of the 

 muscles of the calf. The rats, the author states, recover from this 

 procedure quickly, and without any marked lameness resulting, pro- 



