144 
scanty, In exactly similar ness of the same date growing 
Maga identical conditions microsporogeny only occurred after 
ur weeks’ time, peck: the peemeeire sporogeny is most 
stages reversed or 0 
This résumé of Ges: md cases of premature microsporogeny 
in the formation of microconidia. in it may ointed oat 
that the results oiicined eae pee saihend ne not sorttuda with 
each other or with those either of myself or of se. investigators* 
and it would appear that in these abnormal cases the usual life 
stage—(with a sclerotial stage according to nutritional con- 
ditions) has been issn & interfered with and the spore stages 
reversed, or even elimin 
This epeceice eat ot Tite ‘eyele i is by no means a rare occur- 
rence in the vegetable kingdom. Perhaps one of the most strik- 
ing cases is that ‘deter ibed by Mébiust of the oak in which almost 
certain developmental stages in many elk s ants orna- 
mental s ry subjecting them to specific quantitative changes 
of environment, such as temperature and humidity. § he case 
technique. Thus Klebs has shown that ‘‘ by modifying the 
external conditions it is possible to induce fungi to grow con- 
tinuously for several years or, in the course of a few days, to 
die after an enormous production of sexual or asexual cells. In 
some instances even an almost complete stoppage of growth ma 
be caused, reproductive cells being scarcely formed before the 
organism is again compelled to resort to'reproduction. Thus the 
sequence of the different stages in development can be modified as 
we ma 
The reproductive stages in the life cycle of Botrytis synchronise 
with crests in the rhythmic working of the metabolic changes in 
the hietteee When these changes proceed eager ted Ae the 
e for ee Behrens ; Smith, R. E.; Istvanffi; Reidemeister + 
rete (loc. 
MAE There vs no io evidence for the connection of Botrytis cinerea with 
t ewer ? Beitrige zur Lehre von der Fortpflanzung, Jena, 1897. 
§ See Molisch, H.: Das Warmbad, Jena, 1909. 
