Adaptation phenomena in human body subjected to several hours of labor a day under an artificial environment of high temperature and humidity in a vinyl greenhouse were studied in the same subjects as reported previously, by the comperative observation of specific gravity of blood, differential leucocyte count, serum potassium, and serum cholin-esterase activity.
Results obtained were as follows: 1. When a farmers changed his work from outside to inside of the vinyl greenhouse, neutrophils and ChE activity suddenly decreased in comparison with the controls, while lymphocytes suddenly increased.
Serum potassium at this stage was low.
These values and dynamic changes are similar to those in parasympathicotonia usually seen in summer.
2. A sudden change of the body reaction to that of the summer type has probably took placo in order to adapt it to the summer-like climate in the vinyl greenhouse.
Since such change is unusual with adaptation to natural climate, this might be called an insufficiency in adaptation to climate.
3. Since such changes take place in cold and warming-up seasons, cold and bronchitis are often found.
4. As a result of periodic examination, decrease in specific gravity of blood was noted along with the change in the body condition to summer type of farmers working in vinyl greenhouse.