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Wïth përfeci certainly it is proved hère, that slightly 

 touching a calico diseased plant and then a healthy one 

 is enough to infect it. 



In the above described experiments the touching was 

 performed bij searching for caterpillars, chiefly in the 

 youngest leaves of the plants. It is without any doubt, 

 that one coolie causes far more diseased plants than another. 



This dépends in my opinion both on his knowledge 

 of his work and the strength of his eyesight. 



A coolie who lias the knack of planting and is also 

 sharpsighted goes through his tobaccoplants and sees at 

 once, without need of touching them, if fhere is a 

 caterpillar in the bud or not. If lie sees no traces, he 

 passes on but should there be one lie removes it deftly 

 without disturbing the leaves. 



A coolie who has had but little practice or one who 

 is shortsighted marches for caterpillars on every plant 

 and fumbles the topleaves individually. 



The resuit would be, that in the flrst instance the 

 chance of extended spreading of the disease on the 

 field would be less than would be the case in the 

 second. 



According to the opinion of some tobacco-growers the 

 notorious „calico-coolies" are generally old or those who 

 hâve had but little practice, whilst I can affirm, that 

 some coolies who had nearly every year nothing but 

 calico plants in their fields proved on examination to be 

 extremely shortsighted. 



Setting aside the nature of the contagion it proves, 

 that it can be very easily transferred from perfectly 

 uninjured diseased plants to healthy ones without the 

 aid of external damage. 



It is therefore advisable to remove at once and with 

 care any plant from the field as soon as it begins to 



