DEPARTMENT REPORTS. 61 



partitions are made of brick. These afford stren^h to the building, and 

 also partition walls with a brick facing:, which is highly desirable. 

 They are faced with sand brick, the seams are well flushed, and the 

 entii-e surface painted over. Where it was impossible to secure brick 

 partitions, they are made of studding, lath, and adamant, the surface 

 of which is also painted. 



The interior wood finish is of southern pine; the lioors are of hard 

 maple, and the ceilings of steel. 



The lighting of the building is very satisfactory, and, inasmuch as 

 the large laboratories are made to face the north and east, it makes it 

 possible to carry on work without interference from the direct rays of 

 the sun. 



The floors of the basement and stable are of cement, but otherwise 

 these rooms are finished as the first and second stories of the laboratory. 



The sinks, the bottoms of the hoods, and two tables are of Alberene 

 stone. The supports for tables and hoods are of iron piping. 



The building is well equipped with gas, hot and cold water, steam, 

 and air which is now used in conjunction with the gas. 



A word may be said in regard to the temperature rooms, because the 

 longer we are in the building, the more valuable they become. The 

 floors of these temperature rooms and the ceilings, are of cement. Each 

 of the rooms opens into a large shaft by means of a glazed surface, and 

 this shaft passes from the basement out beyond the roof of the build- 

 ing. If, in any way, an explosion occurs, which is not too forceful, we 

 trust that the glass will be shattered and a vent furnishexi by means 

 of the shaft. These rooms have iron doors, and open into outer rooms 

 bv means of small ante-rooms, which are closed bv iron doors. If fire 

 occurs, within, it is thought that it will be held within by these iron 

 doors. AVe further try to avoid fire by using only one burner within each 

 room. If this goes out, there will be no light within to cause an explosion, 

 for all of the lighting is by means of electricity. ATe have already found 

 during the winter months, when the steam is on the building, that, 

 although these rooms were not heated in any way, the temperature was 

 l)ractifally constant, varying only one or two degrees over a range of 

 several days. During the whole winter season, taking into considera- 

 tion the times when the steam was turned off the building for one pur- 

 l)0se or another, the maximum temperature limits of these rooms were 

 within 19° and 24° C. AVe are very much pleased with the success of 

 this innovation. The idea was borrowed, however, from the laboratory 

 of Dr. ;Moore, of Cornell, being modified to meet the requirements neces- 

 sitated by the construction of several temperature rooms. 



Respectfully submitted, 



C. E. MARSHALL, 

 Professor of Bacteriology' and Hygiene. 

 Agricultural College, Mich, 

 June 30, 1904. 



