116 EXPERIMENT STATION RECORD. 



On the determination in the wet way of carbon and nitrogen in organic sub- 

 stances, P. FRETSCH (Ann. Chem. u. Phys., 294, pp. 79-SS). 



The quantitative estimation of nitrates and nitrous acid, P>. GrPtzner (Arch. 

 Pharm., 235 (1S97), No. 4, pp. 241-245). 



An automatic titration apparatus, Peters and Rost (Chem. Zig., 21 (1S97), No. 

 86, p. 351, fig. 1). — The vessel intended to hold the standard liquid resembles a Wold's 

 llask with 3 necks, through one of -which the burette stem enters, through another 

 the overflow tube, and to the third a rubber bulb is attached. The distinguishing 

 feature of this burette is the bulb -at the top, which serves as an overllow attach- 

 ment, and the tube connecting this bulb with the supply llask. Pressure on the 

 rubber bulb fills the burette to the overflow, then when the overflow tube is opened 

 the excess of liquid runs back into the supply flask, leaving the column of liquid in 

 the burette standing exactly at zero. — J. T. andekson. 



A small vacuum apparatus, Haussman (Chem. Ztg.,21(1897), No. 36, p. 352, fig. 1).— 

 The evaporating vessel consists of a porcelain cylinder with the upper rim flanged, 

 to which closely fits a glass funnel, provided with a T-tube and connected thereby 

 with an exhaust pump. The cylinder is made to fit into an ordinary water bath. — 



J. T. ANDERSON. 



A new wash bottle with stopcock and ventilating closure for the preven- 

 tion of evaporation and fouling of the wash liquid, M. Stiiili Chem. Ztg., 2 1(1897), 

 No. 40, p. 396, fig. 1). — The apparatus is in two pieces, the flask with the attached 

 moulh tube in one and the stopper and delivery tube in the other. In the side of 

 the hollow-ground stopper is a hole, which when opposite the month tube allows 

 communication with the interior of the llask. A slight turn of the delivery tube 

 closes the flask securely. — J. i . ANDERSON. 



A stirrer for laboratories, A.Prager (Chem. Zlg.,21 (1897),No.3S, p.379,fig.l).— 

 A horizontal shaft, arranged for either hand or machine power, carries any desired 

 number of conical cogwheels. These worb into other conical cogwheels whose axes 

 are vertical and carry clamps for holding the stirring rods. — j. t. axdekson. 



A stirring machine for laboratories, A. Prager (Chem.Ztg., 21 (1897), No.88, 

 p. 379, fig.l). 



An outline of the theory of solution and its results, .1. L. R. Morgan i X< •»• 

 York: John Wiley <Y Sons. London: Chapman $• Hill, 1897, pp. 63). 



The principles of mathematical chemistry, G. He i.m i New York: John Wiley 4' 

 Sons. Loudon: Ghapman f Hill, 1897, pp. 228, figs. 17). — Translated from the German 

 by J. L. R. Morgan. 



Handbook for the bio-chemical laboratory, J. A. Mandel (New York: J. Wiley 

 A- Sow. London: Chapman A Hurt, 1896, pp. 101). — Methods of preparation and tests 

 for a number of compounds. 



BOTANY. 



On the action of light on diastase and its biological signifi- 

 cance, '1. R. (Irekx (Proc. Roy. Soc. | London}. (II (1897), Xo. 369, pp. 

 25-2*). — This is an abstract of a paper read before the Royal Society 

 February 25, 1897. The author was led to undertake the experiments 

 upon which this paper is founded by the statements of Brown and 

 Morris that the quantity of diastase in foliage leaves undergoes con- 

 siderable variation during the L'i hours of the day, being 1 greatest in 

 the early morning and lowest in the evening-, particularly after several 

 hours of sunshine. The experiments of the author were carried out 

 during the past three years to ascertain whether the diminution in the 

 quantity is due to a destructive influence of the light upon the enzym 



