no TECHNICAL ANALYSIS 



CHAPTER IV. 



THE TECHNICAL ANALYSIS OF AIR AND WATER 

 FOR MICRO-ORGANISMS. 



1892. 



i. ONE of the first of the more extensive investigations 

 which I undertook on commencing my studies of the micro- 

 organisms was the " Investigation of the organisms which 

 occur in the atmosphere in and around Carlsberg at different 

 times of the year, and which are capable of developing in 

 beer wort." * 



As the title indicates, these investigations throw light upon 

 those species of atmospheric micro-organisms which are able 

 to develop in wort, and upon their occurrence, both in the 

 brewery and in the open air, at the different seasons of the 

 year. Special attention was paid to the question of the 

 habitat of these organisms. In this, as in several of my 

 other investigations, theoretical and practical studies are 

 closely united. Prominent amongst the former is the investi- 

 gation of the cycle of alcoholic ferments in nature (see also 

 Chapter VI.) ; the results obtained have, on the other hand, 

 also a practical interest, especially in connection with the 

 manufacture of beer, in that they throw light upon the greater 

 or less danger of infection during the different seasons and 

 under various conditions. To those portions of the treatises 



* * Compte-rendu des travaux du laboratoire de Carlsberg,' I vol. 2 livr., 

 1879, and 4 livr., 1882, Copenhagen. 



