THE ORCHID REVIEW. 21 
Clayi, Phalenopsis denticulata, Cypripedium concolor, virens, X Sallieri, 
X Swanianum, and X Fitchianum, Platyclinis uncata and cucumerina, 
Angraecum pellucidum, and Eulophia virens. 
It is curious to note that while Sophronitis violacea and Angrecum 
sesquipedale were destroyed, their respective allies Sophronitis grandiflora 
and Angrecum pellucidum were not perceptibly injured, and the same 
thing may be seen in the genera Dendrobium, Oncidium, Phalznopsis, 
and Odontoglossum. Differences in the texture of the flowers may partly 
account for this, but this is not all the reason, as a comparison of the flowers 
will show. 
As regards treatment during these fogs it should be noted that 
precautions were taken to prevent the fog from entering the houses by 
keeping the ventilators perfectly closed and only using the doors which do 
not open directly into the open air, so that the fog could only gain an 
entrance between the laps of the glass. The atmosphere was also kept 
rather on the dry side, but in spite of all this the effects were disastrous, 
and, apart from the flowers, the effect on the plants themselves, though not 
so obvious, must have been considerable. Remedial treatment seems of 
little avail during a bad spell of London fog, though all possible precautions 
should be taken in the interests of the plants. It is heart-rending to witness 
such wholesale destruction, and we have heard it remarked that it is useless 
to grow Calanthes and some other winter-blooming Orchids within the 
fog area. 
CALENDAR OF OPERATIONS FOR JANUARY. 
ALTHOUGH still in the middle of the winter season, the gradually lengthening 
days, and the signs of renewed activity, will soon remind us that a new 
year has commenced for our favourites, and urge us to lose no time in 
making all necessary preparations for the busy season which will soon be 
upon us. If the supply of potting materials, or of receptacles in which the 
plants are grown, is at all low, fresh supplies should be got in, so that 
potting operations can be attended to in earnest when the proper season 
arrives. A little foresight at this period will prevent many vexatious delays 
hereafter, and nothing is more detrimental to the well-being of the plants 
than operations of this kind being delayed beyond the proper season. 
The winter treatment must still be continued, so far as temperatures and 
watering are concerned, but advantage should be taken of any spell of mild 
weather to increase the amount of ventilation, and during sunshine let the 
temperature rise a few degrees above that of dull days when fire-heat alone 
has to be relied on. The following temperatures should be maintained as 
nearly as circumstances will permit :— 
