56 The Microscope. 



NEV/S FRO/A 

 THE Vv^ORKERS 



Dr. Radhael Blanchard, in the Journal de Micrographie, says 

 that of the fungi parasitic on man, there are only four whose 

 direct transmission to us from the animals with which we are 

 commonly connected can be demonstrated. These are Achorion 

 Ardoingi^ Busquet, 18T1 ; Achorion Schoenleinii Remak, 1845; 

 Trichophyton dejytlans, Megnin, 1878 ; Trichophyton tonsurans, 

 Malmsten, 1848. Direct contagion from animals to man is very 

 probable but not proved, for these four: Actinomyces bovis, 

 Harz, 1877; Microsporan Audouini^ Gruby, 1843; Lepocolla 

 repens, Eklund, 1883 ; Aspergillus fumigatus, Fresenius. 



Microscopic anatomy of the human heart. — Dr. A. Y. 

 Meigs^*" says the return vessels in the substance of the heart, ex- 

 cept a few of the la.rger size, have thin walls and a structure 

 identical with that of the most minute capillaries. In this re- 

 spect they present a strong contrast with the arterioles, as the 

 latter, even when of very small size, are similar in structure with 

 large arteries, both having three coats. At points where these 

 return vessels are formed by the coming together of minute cap- 

 illaries, the number going to form the return vessel is very much 

 greater than at corresponding positions where arterioles (supply 

 vessels) break up, and the angles formed are much less acute, 

 right angles even being formed at such junctions of the venous 

 vessel. 



The observation of the presence of spaces in the fibres of nor- 

 mal human heart-muscle is likely to prove of great importance, 

 if the explanation that they are capillaries is correct. The fact 

 that endothelial nuclei can be seen at the edges of such spaces in 

 almost all properly prepared sections, and that occasionally even 

 the whole circle of the endothelial wall is visible, would seem 

 almost conclusive evidence of the correctness of this explanation. 



^Amer. Jour. ISIed. Sciences. 



