124 



Journal of Applied Microscopy. 



Some Apparatus to Facilitate the 

 Work of the Histological and 

 Embryological Laboratory. 



Every teacher who has to direct the 

 work of beginning- classes and of thesis 

 and research students, is compelled from 

 time to time to make modifications of 



tention is called to the following pieces 

 of apparatus, hoping that they will serve 

 to g-ive hints to other teachers, and 

 trusting that they, or some modification 

 to meet special needs, will prove as ser- 

 viceable to other laboratories as they 

 have to my own. Most of them have 

 been figured and described already in 

 some form. The figures here given re- 



Name of Article 



From • 



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11 "h Date ^^-^AJL. t B~, ll'il 



itXt^ - 



Address 



Order No. 



Date of receipt of Articles 





Remarks U. Sj^JL 4-Otv' \P O^ (tTW J- o. T s CLo<.«dL. ^ (Tr- M^-i^r 



Dep't. 



(HLCs.t.Q-t, 



NEW YORK STATE 



VETERINARY COLLEGE, 

 CORNELL UNIVERSITY. 



Pig. 1. Inventory card. 



apparatus, or under special stress to 

 construct wholly new pieces. Indeed, as 

 has been well said, a laboratory teacher 

 who is not also something of an inventor 

 cannot attain the highest success. At- 



present the latest and most satisfactory 

 modifications. 



To begin with, the laboratory teacher 

 is in most cases held responsible for the 

 property of the laboratory, and it falls 



10 CENTIMETER RULE. 



The upper edge is in millimeters, the lower In centimeters and half centimeters. 



THE METRIC SYSTEM. 



UNITS. The most commonly used dh'isions and multiples. 



n-xi,? ArrTcn T;.r,K (Centimeter (cm.), 1-lOOth Meter; Millimeter (m.m.), 1-lOOOth Meter; Micron (f'), 

 T^NrTH 'S 1-lOOOth Millimeter ; the Micron is the unit in Micrometry. 



LENGTH . . . \^^iiometer, 1000 Meters ; used in measuring roads and other long distances. 

 THE GRAM FOU f Milligram (m.g.), 1-1000 gram. 



WEIGHT ... 1, Kilogram, 1000 grams, used for ordinary masses, like groceries, etc. 

 THE LITER FOR ^ Cubic Centimeter (c.c), 1-lOOOth Liter. This is more common than the correct 

 CAPACITY . . ( form. Milliliter. 



Divisions of the Viiits are indicated by the Latin prefixes : deci, 1-lOth ; ccnti, 1-lOOth ; milli, 

 1-lOOOth. 



Multiples are designated by the Greek prefixes : deka, 10 times ; hecto, 100 times ; kilo, 1000 times ; 

 myria, 10,000 times. 



[This card (12}^ 1)4 cm.) is the size used for library catalogs.] 



Fig. 2. The metric system in a nut-shell. 



