19th. I watched with amazement how the reindeer behave when the weather is hot. They do not stand still for a minute, hardly for a second, even. They toss, jerk, flick and snort etc. and all for the sake of one little fly. There were no more than 10 flies to a herd of 500 reindeer and yet every single reindeer was trembling and fussing. The larger flies were attacking with greater vigour but as soon as they landed the reindeer were quick to shake them off. The flies had plenty of chances because most of last year’s fur had fallen out. I caught one fly that was flying past: its sexual organs were exposed and there was a little egg, quite white and as big as …[word missing in original], in the small opening. Her rear part consisted of 4 or 5 small tubes that fitted within each other like a telescope and which she could retract just like an ordinary fly. This fly, as I have said earlier, is the cause of reindeer boils.