488 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Fig. 



prism is mounted on a short pin on an adjustable slido at the side of 

 the box. 



Eye-shades.— These "shades," intended to be placed in front of the 

 unused eye in microscopical observations, have hitherto been blackened, 

 but it is suggested * that it would be preferable if thoy were white. 



Dumaige's Nose-piece for Changing Objectives. — This device 

 (fig. 77) of M. Dumaige somewhat resembles that of the Geneva 

 Physical Instrument Co., described in this Journal, 

 1884, p. 284. It differs from that, however, in 

 the use not of two hinged plates kept together 

 by a set screw acting on a spiral spring, but of 

 two spiial springs, as shown in the figure, which 

 press the lower horseshoe plate against the ad- 

 apter. The objective is provided with a sloping 

 flanged collar, which is slipped between the lower 

 plate and the adapter, and is held fast by the 

 action of the springs. In order to further secure 

 it there is an annular countersunk piece in the 

 adapter into which the collar fits. 

 Malassez's Hot Stage.f — M. L. Malassez has devised a hot stage 

 which is both simple and handy. It consists (fig. 78) of a metal 



Fig. 78. 



plate, covered over so as to form a box, into which the preparation is 

 slipped. From the front of the plate projects a flat double arm, also of 



* Queen's Micr. Bull., v. (J 888) p. 5. 



f Arch. <le Physiol., viii. (1886) pp. 271-3 (1 fig.). 



