514 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



a large square stage 3f in. by 3£ in., on which large sections or the 

 contents of a Petri dish can be examined. 



Stand No. 2 (fig. 74) is similar to the above, with the exception of 

 the stage, which is mounted above the trunnions to allow a Mayall 

 adaptable mechanical stage being fitted. The instrument is mounted 

 on a tripod claw foot and is provided with either a substage having 

 diagonal rack-and -pinion or spiral screw focusing adjustment. 



Plane and concave mirrors of 50 mm. diameter are supplied in 

 gymbals, mounted on a tail -piece with universal movements. 



Baker's New Model Histological Microscope.* — This instrument 

 (fig. 75) is a smaller type of the D.P.H. No. 2, but has only one milled 

 head actuating the fine-adjustment. 



Nachet — Microscope pour determiner les taches de sang visibles ou invisibles, 

 recentes ou anciennes, sur un corps opaque. 



C.R. Assoc. Anat., 10 Reun., Marseilles, 190S, pp. 201-3 (2 figs.). 



Gebhaedt,.W. — Aus Optischen und Mechaniscnen Werkssatten ii. 



[The writer continues his review of improvements in English and foreign 



Microscopes.] Zeitschr. tuiss. Mikrosk., sxv. (1908) pp. 452-71 (10 figs.). 



Note. — For the writer's first paper see Tom. cit., p. 36. 



1.3) Illuminating and other Apparatus. 



Simplified Apparatus for Drawing with the aid of the Projection 

 Microscope.j — W. A. Riley's simple device is intended for use in the 

 lecture room where a projection outfit stands, without duplication of 



Fig'. 76. 



•apparatus or requirement of extra space. It consists (fig. 76) of a rod 

 holding a mirror at an angle of 45°, clamped to the stand which carries 

 the projection lantern or the micro-projection outfit. In a darkened 



* C. Baker's Special Catalogue, 1909. 

 t Science, sxix. (1909) pp. 37-8 (1 fig.). 



