_September 2._—I have been quite happy for three hours. I must note down what I’ve learned. M. Blot brought his microscope to the Infirmerie des Élèves. I was exceedingly interested in his microscopic lecture. He showed us in a work of M. Hébert’s the difference between the epithélium pavimenteux, such as covers the tongue, skin, &c., and the epithélium vibratile, as in other parts, and the fibro-plastic formations in the reparation of tissues, showing specimens of each kind. The first species was represented by a cellule full of little cellules, a _noyau_ in the centre containing a nucleolus—thus.... The second was of elongated form, thus.... The third represented the growth of fibre from cells, which cells are distinguished from the first by the relatively smaller size of the _noyau_, thus.... By such examination different formations can be distinguished from each other; thus cancer possesses very distinctive elements. It is necessary to examine bodies of varying shapes under different foci of the microscope, otherwise illusions may be created. In illustration he placed some blood globules, and showed us that what appeared a central spot in each globule was owing to the convexity not being in focus, and it disappeared when the focus was a little lengthened. He spoke also of a paper read before a society yesterday by a young physician, which proved that the azote, which in the ox is voided by the excrement, in the cow is absorbed into the milk; and that the difference in the manure of the two is great. He is busy himself now in preparing for an examination of _internes_; if he gain the gold medal, he has the right to enter any hospital he chooses as _interne_ for a second term, and receive also his M.D., not otherwise granted to an _interne_. What chance have women, shut out from these instructions? Work on, Elizabeth!...