Student or Learner
Would you be kind enough to explain to me the non-observance of the rules concerning the sequence of tenses in the following sentences?
1.Kelner discovered that visible light has the remarkable ability of restoring viability.
2.It was found that ultraviolet-activated phages cause marked alterations of cell structure.
3.They believed that, on treatment of beechwood lignocellulose with ozone the latter reacts with the cycllohexanone group.
4.He established the formula of the alcohol and suggested that saponification of the ester proceeds as follows.
5.Doisy initially stated that these and related degradation products possess several times the estrogenic potency of pure estrogen.
6.The author claimed that formula II is in good agreement with the following experimental results.
Thank you for your efforts.
I agree; if it holds true...