Tue Microscope. 205 
have been among you I have felt that my interest in microscopy 
has widened. I feel that there is more earnest work being done 
here than I have hitherto realized. Anything I can do to fur- 
ther your interest I shall do with the greatest pleasure.” After 
referring in complimentary terms to President Cox’s address, 
Dr. Dallinger alluded to the death of Robert Tolles, saying the 
English microscopists regretted the decease of the eminent 
optician fully as deeply as American scientists had done. 
eo 
A NEW FORM OF SECTION CUTTER. 
BY PROF. WM. A. ROGERS. 
ea William A. Rogers read a paper on a ‘ New 
Form of Section Cutter.” The two features of a section cut- 
ter in which the speaker thought improvement could be made 
were: First, a method of moving the plate to which the sec- 
tion to be cut was attached over a definite and a known dis- 
tance. Second, a method of firmly holding the plate in posi- 
tion during the operation of cutting the section. The speaker 
said it was proposed to move the plate between two vertical 
walls as guides over the distance required as indicated by a 
graduated scale attached to the plate and in the focal plane of 
an objective attached to the frame upon which it moved. The 
movement of the plate might be made either by a screw or by 
tapping with a smallhammer. In order to hold the plate firmly 
in position after the movement had been made under the mi- 
croscope the plate rested upon the poles of four magnets, which 
projected through the frame from beneath. When the circuit 
was completed the plate suffered no disturbance, since it rested 
directly upon the cores of the magnets. Disturbance was only 
produced when there was motion. Here no motion could take 
place. Moreover, the observer by an examination of the grad- 
uated scale, while the circuit was being completed, could be 
sure that the operation of clamping had produced no disturb- 
ance in position. Professor Rogers illustrated his plan by dia- 
grams on the blackboard. 
