INJURIOUS EFFECTS OF ILLUMINATING GAS. 



281 



Figure 2. Styles protruding from buds of "Scarlet Glow" carnation three 



weeks after gas injury. 



very closely as is typical for gas injury to carnations. When examined 

 on February 3, some three weeks after the original injury, this particular 

 variety of carnation showed a very peculiar situation. The styles were 

 projecting from the tips of the buds, now somewhat swollen, but not 

 showing any tendency to open fully. This peculiar feature is clearly 

 shown in the figure (Figure 2). In the other varieties of carnations the 

 buds that had commenced to open remained closed and the calyx dried 

 and shriveled up to form a sharp pointed cover to the apparently dead 

 corolla within. Flowers that were open at the time had their corollas 

 killed outright. 



Defoliation did n6t occur on the carnations at all tho on many other 

 species this was the most characteristic symptom noted. For example, 

 the roses showed complete defoliation, as clearly shown in the figure 

 (Figure 3). Varieties of roses in which growth was being forced very 

 rapidly had many of the young shoots very much killed back and all these 

 plants were of necessity discarded. The different sorts of Coleus showed 

 different degrees of defoliation — this varied somewhat with the different 

 varieties. Figure 4 shows the condition of most of the Coleus plants 

 soon after the gas injury, while figure 5 shows the regeneration of new 

 shoots at the base and the apparent recovery of the terminal bud from 

 which some leaves have been formed. 

 10 



