The liquid crystal phase transitions of 4-n-pentylbenzenethio-4 prime -n-octyloxybenzoate were studied as a function of pressure and temperature. There were no pressure induced anomalies. The latent heat was measured at the N-I transition (. 5 plus or minus . 1 calories/gram) but evidence for a latent heat during both the A-N and C-A transitions couldn't be observed. It is speculated that the continuous nature of these transitions may be linked to the flexibility of the polar part of the crystal.